GSA Automation of Court Design Guide1

GSA Early Concept Design Project – Energy Analysis

Paola Sanguinetti

Chuck Eastman

Georgia TechCollege of Architecture

GSA Automation of Court Design Guide2

Early Concept Design is a crucial early step for GSA project review

GSA Automation of Court Design Guide3

Lower Level

Level 1

Example Early Concept Design

Model defined as :

•set of 3D space objects, carefully named

• composed on slabs – also used for roof

•exterior walls with no construction, percent glazing, with R-values, degree self-shading

Easily defined in all BIM design tools

GSA Automation of Court Design Guide4

Project Purpose

Revit Model

Bentley Model

ArchiCad Model

Digital Project Model

common IFC file format

space program review

simple energy load analysis

circulation & security review

cost estimateprovide significant automated

feedback for early stage concept design

GSA Automation of Court Design Guide5

propose to use Energy+ with defaults. Would expect that defaults could be adjusted by energy consultant for later stages of design

GSA Automation of Court Design Guide6

Energy Usage Analysis Module

ADDITIONAL INPUT DATA TO BE INCLUDED IN THE BIM

-Building North Axis

-Solar Distribution

-Location (City & State)

-Exterior Walls

-Material

-R-value

-Fenestration

-% of windows on each wall

- ratio of width to length

-Frame & mullion information

-Material

-Floors underground (or partially underground)

GSA Automation of Court Design Guide7

Energy Usage Analysis Module

2 ENERGY ANALYSIS SCENARIOS IN EARLY CONCEPT DESIGN:

-1 ZONE

- Building modeled as a single thermal zone

-2 ZONE

-Atrium or 2-story Lobby space

-Will require different default for schedule and set point temperature

- Other spaces in the building as a single zone

GSA Automation of Court Design Guide8

Mechanical Systems Narrative

GSA Automation of Court Design Guide9

Purposes of Building Shell Energy Analysis

Siting, orientation and relative shading by different sources, effect of below grade parts of bldg.Building shape and exposure of building surfaces

Shading devices on exterior – if defined

Significance of insulation of annual energy costs

Building mass – use in energy capture and dissipation

Building floor area to external skin area ratio

Provide relative energy usage comparison for assessing different design concepts

Significance of atriums, courtyards, other architectural features on energy use

Natural lighting determined by depth of spaces

Other items?

GSA Automation of Court Design Guide10

Building Shell Energy Analysis

We plan to replicate this report using Energy-Plus, with interface to the model. Will allow default parameter management by experienced E+ users.

Using an efficiency factor, should just turn these figures into energy usage/yr.

GSA Automation of Court Design Guide11

Mechanical Systems Analysis

Not sure what calculations to do about mechanical system performance. we propose to default these factors, except in

exceptional projects

GSA Automation of Court Design Guide12

Building Cooling LoadBuilding Heating loadMECHANICAL SYSTEMS

Building Cooling LoadBuilding Heating loadMECHANICAL SYSTEMS

Building Cooling LoadBuilding Heating loadMECHANICAL SYSTEMS

FOR EACH ALTERNATIVE LAYOUT, IDENTIFY THE DIFFERENCES IN ENERGY REQUIREMENTS

Provide separate energy analysis for each orientation on site.

247 Tons 3554MBH

215 Tons 2984MBH

GSA Automation of Court Design Guide13

Thank you,

The Georgia Tech Team